ASP/MAGNUM FS400AR Rebuild/Overhaul
02-13-2014, 07:19 AM
#2776
Senior Member
Filling W/sand is the hard way, but unless you have a tubing bender W/the proper bend radius & tube size your SOL. Speaking as a journeyman pipefitter & tubing bender.
Last edited by SrTelemaster150; 02-13-2014 at 02:47 PM.
02-13-2014, 07:46 AM
#2777
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I don't think the crinkles will make any real difference to the efficiency given that the pipe diameter will be rather big. I have lengths of 11mm I/d stainless flexi pipe on my 400 and I noticed no drop in power compared to straight headers
02-13-2014, 09:15 AM
#2778
BJ see if you can get some large diameter flexi stainless tubing. Its designed to be flexible and silver solders (brazes) well. I know that Rev was using this on his Laser 300v and saito 450 radial.
http://exhaustpartsuk.com/images/SDC17849_1.JPG
http://exhaustpartsuk.com/images/SDC17849_1.JPG
The folds are supposed to provide some noise attenuation. The Saito flex pipes are fragile. A ring collector would provide more physical support if you could fabricate one.
02-16-2014, 12:09 AM
#2779
I just had a thought. I recall, from working on full scale radial engines, that the exhaust collectors were fabricated from many short pieces that were welded together. Sooooooo.......
I think using 1" tube, it might be easier to bend short sections, without kinking it, and then just brazing the pieces together. It would mean a lot of waste, because a short bent section would be sawn out of a longer piece. But copper commands a fair penny at the scrapyard.
02-16-2014, 01:25 AM
#2780
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Yep - considered that approach too, Tom.
Might actually work out ok if I can get my hands on a few copper 'elbows' - if they make them for around 1" diam tube connections...
BJ
Might actually work out ok if I can get my hands on a few copper 'elbows' - if they make them for around 1" diam tube connections...
BJ
02-21-2014, 11:07 AM
#2781
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ok guys, i guess its time to spill the beans. I am no longer a member of this brotherhood. I sold my second and last fs400 radial this week and i carried it to the post office with a slight fainted heart.
the reason I sold it arrived today. I have bought myself a lovely wooden box for the money (plus a couple of euros on top of that).
I am still servicing these engines if need be but currently I "only" have the evo 7-77 which is making me very happy.
Rev
the reason I sold it arrived today. I have bought myself a lovely wooden box for the money (plus a couple of euros on top of that).
I am still servicing these engines if need be but currently I "only" have the evo 7-77 which is making me very happy.
Rev
02-21-2014, 11:52 AM
#2782
ok guys, i guess its time to spill the beans. I am no longer a member of this brotherhood. I sold my second and last fs400 radial this week and i carried it to the post office with a slight fainted heart.
the reason I sold it arrived today. I have bought myself a lovely wooden box for the money (plus a couple of euros on top of that).
I am still servicing these engines if need be but currently I "only" have the evo 7-77 which is making me very happy.
Rev
the reason I sold it arrived today. I have bought myself a lovely wooden box for the money (plus a couple of euros on top of that).
I am still servicing these engines if need be but currently I "only" have the evo 7-77 which is making me very happy.
Rev
Let me guess: it's a Kolm multicyl. engine?
02-21-2014, 06:32 PM
#2786
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...on another note - just got me some 1" copper pipe and some 90 deg elbow/joiners... and 5% silver braizing rods.
Plan is to open the 90 deg joiners out to 72 deg so that 5 of them with short sections of 1" straight tube should form a pentagonal circle. By the look of it so far, the internal surfaces should be pretty smooth and almost be a circle.
I'll post up some pics as I go.
Could turn out ugly-as and completely unfunctional... or it might just work
BJ
Plan is to open the 90 deg joiners out to 72 deg so that 5 of them with short sections of 1" straight tube should form a pentagonal circle. By the look of it so far, the internal surfaces should be pretty smooth and almost be a circle.
I'll post up some pics as I go.
Could turn out ugly-as and completely unfunctional... or it might just work
BJ
02-21-2014, 06:41 PM
#2787
Senior Member
...on another note - just got me some 1" copper pipe and some 90 deg elbow/joiners... and 5% silver braizing rods.
Plan is to open the 90 deg joiners out to 72 deg so that 5 of them with short sections of 1" straight tube should form a pentagonal circle. By the look of it so far, the internal surfaces should be pretty smooth and almost be a circle.
I'll post up some pics as I go.
Could turn out ugly-as and completely unfunctional... or it might just work
BJ
Plan is to open the 90 deg joiners out to 72 deg so that 5 of them with short sections of 1" straight tube should form a pentagonal circle. By the look of it so far, the internal surfaces should be pretty smooth and almost be a circle.
I'll post up some pics as I go.
Could turn out ugly-as and completely unfunctional... or it might just work
BJ
02-21-2014, 07:43 PM
#2788
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What - and maybe run the exhaust headers directly into the 3/8 of the T?
Hmm... might be an idea (would have saved me about 40 bucks - I bought 1m of 25mm (1") and 1m of 10mm straight pipe for around $20 per length. A store down the road had annealed 1" on a coil - 60 dollars a metre
Nera mind - got something to play with this arvo
BJ
Hmm... might be an idea (would have saved me about 40 bucks - I bought 1m of 25mm (1") and 1m of 10mm straight pipe for around $20 per length. A store down the road had annealed 1" on a coil - 60 dollars a metre
Nera mind - got something to play with this arvo
BJ
02-21-2014, 09:16 PM
#2790
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Yowsa!!
There's quite a gap in the 90 deg elbow once you open it out to 72 deg
Looks like I'll have to find something to fill the gap neatly.
Maybe I should have started with 45 deg elbow, and cut&shut a piece out.
Oh well, I'm committed now...
BJ
There's quite a gap in the 90 deg elbow once you open it out to 72 deg
Looks like I'll have to find something to fill the gap neatly.
Maybe I should have started with 45 deg elbow, and cut&shut a piece out.
Oh well, I'm committed now...
BJ
02-22-2014, 07:45 AM
#2793
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02-22-2014, 10:44 AM
#2795
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02-22-2014, 03:49 PM
#2797
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02-22-2014, 08:17 PM
#2798
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Ok... so I think I may have cut the trial-run elbow a bit too deep - it opened up quite a bit gap when I stretched the angle from 90 deg to ~72 deg. Not sure a gap that big is going to be all that easy to fill.
Soooo... I tried a much smaller cut - more of a knick than a deep cut. I noticed that it tended to stretch the elbow more at the ends than a proper stretch across the middle of the elbow.
Meh - so long as I get a half reasonable Pentagon out of it
BJ
Soooo... I tried a much smaller cut - more of a knick than a deep cut. I noticed that it tended to stretch the elbow more at the ends than a proper stretch across the middle of the elbow.
Meh - so long as I get a half reasonable Pentagon out of it
BJ
Last edited by BJ64; 02-22-2014 at 08:20 PM.
02-22-2014, 09:40 PM
#2799
Senior Member
02-22-2014, 09:43 PM
#2800
Senior Member
Ok... so I think I may have cut the trial-run elbow a bit too deep - it opened up quite a bit gap when I stretched the angle from 90 deg to ~72 deg. Not sure a gap that big is going to be all that easy to fill.
Soooo... I tried a much smaller cut - more of a knick than a deep cut. I noticed that it tended to stretch the elbow more at the ends than a proper stretch across the middle of the elbow.
Meh - so long as I get a half reasonable Pentagon out of it
BJ
Soooo... I tried a much smaller cut - more of a knick than a deep cut. I noticed that it tended to stretch the elbow more at the ends than a proper stretch across the middle of the elbow.
Meh - so long as I get a half reasonable Pentagon out of it
BJ